只有0.5nm厚的绝缘介质。。。恐怕直接量子隧穿短路了。。
不过对于现实一些的尺寸，理想情况下平板电容器的储能只和介质介电常数和介质的总体积以及绝缘介质的击穿场强有关。最大能量密度（能量/体积，忽略极板的值）为
$$\frac{1}{2}(E^2 ε_0 ε_r)$$
对于大部分常见绝缘材料来说这样得到的能量密度是远不如化学电池的。
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